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Flashcards in introduction Deck (17):
1

Anatomy of neurons

Cell membrane
dendrites
axon hillock
axon
meyelin
nodes of ranvier
buttons
synapses

2

What is the resting potential inside a neuron

-70mv

Ions
A- protein inside
Na+ outside
K+ inside
Cl- Outside

3

semi permeable

the neuronal membrane is semi- permeable

4

what are the forces which determine distribution of ion

1. diffusion
2. Electrostatic pressure

5

sodium potassium pump

keep sodium out.
Transports sodium out ans potassium in
There are three NA for every two K
- Requires energy from ATP

6

Moving information from one neuron to another:
Neurotransmission

Neurotransmitters activate receptors on dendrites
opens ion channels
ion cross membrane changing the membrane potential
If the potential felt at the axon hillock is big enough an action potential is triggered

7

ionotropic receptor

Fast acting, do not require a 2nd messenger
acetylcholine (Ach)
Glutamate
GABA

8

metabotrophic receptor

Acts on a g protein which in turn opens channel

dopamine
noradrenaline
serotonin

9

EPSP excitatory post synaptic potential

Depolarize cell membrane
- glutamate

10

IPSP inhibitory post synaptic potential

Hyperpolarize cell membrane
- GABA

11

Spatial summation

when several EPSPs arrive at the axon hillock simultaneously

12

Temporal summation

PSPs arrive in rapid succession can be summed

13

The action potential

All or nothing
Refractory period

14

propogation of the action potential

Depolarization of each segment of the neuron
- myelination greatly speeds up axonal transmittion = saltatory conduction

15

synaptic transmission

information processing

16

fast neurotransmitters

acetylcholine (Ach)
Glutamate
GABA

17

neuromodulators

dopamine
noradrenaline
serotonin